Table 7-16: Troubleshooting the AI Block
(continued)
Symptom
Possible causes
Recommended actions
Mode will not leave OOS
Target mode not set
Set target mode to something other than
OOS.
Configuration error
BLOCK_ERR will show the configuration
error bit set. The following are parameters
that must be set before the block is
allowed out of OOS:
CHANNEL must be set to a valid value and
cannot be left at the initial value of 0.
XD_SCALE.UNITS_INDX must match the
units in the transducer block channel value.
L_TYPE must be set to Direct, Indirect, or
Indirect Square Root and cannot be left at
the initial value of 0.
Resource block
The actual mode of the Resource block is
OOS. See Resource Block Diagnostics for
corrective action.
Schedule
Block is not scheduled and therefore
cannot execute to go to Target Mode.
Schedule the block to execute.
Process and/or block alarms
will not work
Features
FEATURES_SEL does not have Alerts
enabled. Enable the Alerts bit.
Notification
LIM_NOTIFY is not high enough. Set equal
to MAX_NOTIFY.
Status Options
STATUS_OPTS has Propagate Fault
Forward bit set. This should be cleared to
cause an alarm to occur.
Value of output does not
make sense
Linearization Type
L_TYPE must be set to Direct, Indirect, or
Indirect Square Root and cannot be left at
the initial value of 0.
Scaling
Scaling parameters are set incorrectly:
XD_SCALE.EU0 and EU100 should match
that of the transducer block channel value.
OUT_SCALE.EU0 and EU100 are not set
properly.
Cannot set HI_LIMIT,
HI_HI_LIMIT, LO_LIMIT, or
LO_LO_LIMIT Values
Scaling
Limit values are outside the
OUT_SCALE.EU0 and OUT_SCALE.EU100
values. Change OUT_SCALE or set values
within range.
7.6
Troubleshooting guide
If there is a malfunction despite the absence of diagnostic messages, see
for
information on possible causes.
Reference Manual
Service and troubleshooting
00809-0100-4530
April 2019
Reference Manual
183
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